Rotary engine.



PATENTED MAR. 10, 1903'.

H. BERGMANN.

ROTARY ENGINE.

APPLICATION FILED NOV. 7, 1901.

N0 MODEL.

IIIIIIIII/ /(//////////7//////A m R7 Z M 0 W Va A W2 WIT/V5885? aaigvwm UNITED STATES PATENT OEErcE.

HERMANN BERGMANhL'OF BERLIN, GERMANY.

ROTARY ENGINE.

SPECIFICATION forming part of Letters latent No. 722,480, dated March 10 1903.

Application filed November 7,1901. set-m No.81,364. (No model.)

To all whom-it may concern.-

Be it known that I, HERMANN BERGMANN, manufacturer, of Berlin, in the Empire of Germany, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification.

This invention relates to improvements in rotary engines having a rotating piston and a rotating roll serving as counter-piston and arranged between the flanges of the rotating body bearing the piston, the roll or counterpiston being provided with a recess which at the given time opens the path for the rotating piston-body. It is of importance that the side walls of the counter-roll are movable and that the same can be pressed against the inner walls of the rotating body bearing the piston in the direction parallel tothe axis of the latter and of the counter-roll. In the present invention the said counter-roll, as above indicated, has two parts movable with respect to each other and arranged to form a reciprocal support in such manner that these parts under the influence of screw-shaped surfaces are forced apart, and thus tightly pressed against the inner walls of the side parts of the piston-body. By these means the most advantageous and most simple packing of the working space or chamber is obtained. Furthermore, a decrease of the wear of the working parts is brought about, so that the machine is suitable for the highest number of revolutions, having comparatively but little friction and less of steam. One constructional example of carrying the invention into eifect is represented in the accompanying drawings.

Figures 1 and 2 show the rotary engine in a longitudinal and cross section. Fig. 3 is an outer view of the same. Fig. 4 shows the counter-roll in elevation with its parts detached, and Fig. 5 is a sectional detail showing a modification.

In the lower portion of the casing 2 3, carrying the shaft 1 to be driven, the drumshaped piston-body 4 is rigidly connected to the said shaft 1. The body 4 carries flanges 5 5, which form with the remaining parts of the said piston-body a ring-room having in its cross-section the form of a trough. The annular channel, limited at the sides by the said flanges 5 5, is closed by the casing 2.

The packing of the flange 5 of the disk body with respect to the casing 2 is effected, preferably, by resilient packing-rings 10, of asbestos or the like, which are placed between the projecting edges of the flanges 5 and the inner walls of the projecting flanges 11 of the walls 8 8. The roll 15 upon the shaft 14 engages within the working space and divides the same. The piston 15 is supported with one edge by the body 6.

Thecounter-roll 15 consists, as shown in the drawings, of two parts 16 18, of which the one, 16, by web and groove 17, is axially movable on the shaft 14, while the other part, 18, is arranged loosely on the reduced or tapered body 19 of the other part, 16. The body 19 may be guided on theneck 25 of the part 19. Both parts 16 and 18 are supported with respect to each other by the screw-surfaces 21 and 22, so that upon rotation the parts 16 and 18 are pressed apart and against the innor walls of the flanges 5 5. To prevent a squeezing or stopping of the parts 16 and 18, the latter may be provided with tensionsprings between the same, so that an elastic adjustment may take place. As a further means of obviating that the screw-surfaces shall not cause a squeezing or stopping of the counter-roll parts 16 and 18 the same have preferably, as shown in Fig. 4, as strong pitch as possible, so that even without the arrangement or employment of springs, as hereinbe- .fore described, the said stopping of the counter-roll 15 is prevented. The side walls of the counter-roll can be given an angle-shaped edge, as shown at 20, Fig. 2.

To obtain tight rest of the outer mantlesurfaces of both bodies 4 15 between the edges 24 and 25, Fig. 2i. e., of the working chamber at the top-the counter-roll 15 may be resiliently journaled and then bear against the bottom, rotating body 4 by its weight.

The working chamber is formed, as shown in Fig. 1 at 7, whereby the fan-like piston 12, arranged between the two flanges 5 5, is provided with packing means bearing against the surrounding casing 2. A fixed wall of the working chamber is produced by the roll 15 entering the annular chamber. Preferably packing-strips 33 33 are also arranged in the casing-wall, straightening the shuttingofi body or roll in direction cross to its turning movement. The steam or other motive medium introduced at 27, by means of a distributing or valve organ 28, causes an enlarging of the pressure-chamber 7 by acting upon the piston 12, and thus to the rotating body. Simultaneously by means of the toothed wheels 31 32 the driving of the counter-roll is effected. The steam driving the piston 12 exhausts at 29, whereupon the piston 12 enters the recess 26 in the roll, (shown in dotted lines in Fig. 3,) travels along the inner surface of the same, and by the further movement of both bodies is caused to pass out of the opening 26, whereby the counterroll again closes the working chamber and the piston 12 comes into the position corresponding to the new steam-inlet.

In order to get the smallest possible deadspace, it is necessary that the width a of the recess 26 should be as small as possible. For this purpose the speeds of rotation of the rotating body 4 and the counter-roll 15 are different and the peripheral speed of the said counter-roll is greater than that of the piston-body 4. This is attained by corresponding proportions of the gear 31 33. Hereby immediately after the piston 12 has passed through the recess 26 of the counter-rpllthe closing of the pressure-chamber is efiected by the said counter-roll.

The details of the described machine may, as will be apparent, be modified.

The lateral walls 20 of the parts 16 and 18 of the counter-roll can be omitted if only care is taken that the parts 16 and 18 with their edges are held against the walls of the flanges 5 5. Therefore the side walls 20 20 are not necessary for the tight shut-off, so that the parts 16 and 18 may be restricted to small edges, as shown at 30 in Fig. 5.

What I claim, and desire to secure by Let ters Patent of the United States, is

1. A rotary engine comprising a casing having two chambers, a piston in one of said chambers and having end flanges, a longitudinal flange on said piston, 21; counter-roll in the other chamber consisting of a plurality of sections one section being movable longitudinally on another section, the said roll having a recess to receive said longitudinal flange, and means to cause relative movements of the roll-sections to force the ends of the roll against said end flanges of the piston.

2. A rotary engine, comprising a casing having two chambers, a piston in one of the chambers and having end flanges, a counterroll in the other chamber and engaging between said flanges, the said counter-rollconsisting of two parts movable lengthwise one upon the other, the meeting ends of said parts being spirally disposed, and gear connections between the piston and roll.

3. A rotary engine, comprising a casing having two chambers, a piston mounted to rotate in one of the chambers and having a longitudinal flange on its periphery, a counterroll in the other chamber provided with a recess to receive the flange, the said roll consisting of two sections movable lengthwise one upon the other, and a gear connection between the piston and roll.

4. A rotary engine comprising a casing having two chambers, a piston arranged in one of the chambers, and having annular end flanges, and also having a longitudinal flange, a shaft extended through the other of said chambers, and a counter-roll consisting of two sections, one of said sections having'longitudinal sliding connection with the shaft and the other of said sections being mounted to slide longitudinally on the first-named section, whereby the ends may be forced against the end flanges of the piston, the inner meeting ends of said sections being in screw form.

5. In a rotary engine, a casing having two chambers, a cylindrical piston mounted to rotate in one of the chambers and having end flanges, packing-rings engaging the peripheries of said flanges, and also engaging the wall of the piston-chamber, and a counter-roll arranged in the other of said chambers.

I witness whereof I have hereunto signed my name, this 28d day of October, 1901, in the presence of two subscribing witnesses.

HERMANN BERGMANN. Witnesses:

HENRY HASPER, WOLDEMAR HAUPT. 

